Finding the Fourth Proportional to 1,398.74, 1,929.61 and 1,119.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.74 : 1,929.61 = 1,119.37 : x
2. Step 2: Convert to fraction form
   1,398.74/1,929.61 = 1,119.37/x
3. Step 3: Cross multiply
   1,398.74x = 1,929.61 × 1,119.37
4. Step 4: Simplify right side
   1,398.74x = 2,159,945.52
5. Step 5: Solve for x
   x = 2,159,945.52/1,398.74
6. Step 6: Final answer
   x = 1,544.21